例1、 Dear sir/madam: I’m delighted you have accepted our invitation to speak at the Conference in [city] on [date]. As we agreed, you’ll be speaking on the topic "" from [time] to [time]. There will be an additional minutes for questions. Would you please tell me what kind of audio-visual equipment you’ll need. If you could let me know your specific requirements by [date], I’ll have plenty of time to make sure that the hotel provides you with what you need. Thank you again for agreeing to speak. I look forward to hearing from you. Sincerely yours, [name] [title] 例2、 Dear sir/madam: Thank you for your letter of [date]. I’m glad that you are also going to [place] next month. It would be a great pleasure to meet you at the [exhibition/trade fair]. Our company is having a reception at [hotel] on the evening of [date] and I would be very pleased if you could attend. I look forward to hearing from you soon. Yours sincerely, [name] [title] 例3、 Dear sir/madam: [organization] would very much like to have someone from your company speak at our conference on [topic]. As you may be aware, the mission of our association is to promote . Many of our members are interested in the achievements your company has made in . Enclosed is our preliminary schedule for the conference which will be reviewed in weeks. I’ll call you [date] to see who from your company would be willing to speak to us. I can assure you that we’ll make everything convenient to the speaker. Sincerely yours, [name] [title] 例4、 Dear sir/madam: We would like to invite you to an exclusive presentation of our new [product]. The presentation will take place at [location], at [time] on [date]. There will also be a reception at [time]. We hope you and your colleagues will be able to attend.